INCONEL Alloy G-3,UNS N06895，1

### **Product Introduction: INCONEL® Alloy G-3 (UNS N06985)** **INCONEL® Alloy G-3** is a nickel-chromium-molybdenum-iron alloy specifically designed to offer exceptional resistance to a wide range of severe corrosive environments. It possesses significantly improved resistance to localized corrosion, such as pitting and crevice attack, compared to earlier generations of Ni-Cr-Mo alloys. Its balanced composition provides outstanding performance in both oxidizing and reducing media, making it a highly versatile and reliable material for the most aggressive applications in the chemical process, petrochemical, and pollution control industries. A key advantage of Alloy G-3 is its excellent weldability, with low susceptibility to carbide precipitation and subsequent intergranular corrosion in the heat-affected zone (HAZ). It maintains good mechanical properties and fabricability, ensuring long service life in critical equipment. --- ### **International Standards & Material Equivalents** INCONEL Alloy G-3 is standardized across major international specifications for various product forms. | Standard Type | Standard Number | Title / Product Form | | :--- | :--- | :--- | | **UNS (USA)** | **N06985** | **INCONEL Alloy G-3** | | **ASTM** | B582 | Plate, Sheet, and Strip | | **ASTM** | B619, B622, B626 | Welded Pipe, Seamless Pipe & Tube, Welded Tube | | **ASTM** | B574 | Rod and Bar (Low-Carbon) | | **ASME** | SB-582, SB-619, etc. | Pressure Vessel Code Editions | | **DIN (Germany)** | 17744 | NiCr22Mo6Cu | | **Werkstoff Nr.** | **2.4619** | **2.4619** | | **EN (Europe)** | EN 10095 | NiCr22Mo6Cu | > **Note:** INCONEL® is a registered trademark of Special Metals Corporation. The primary identifier is **UNS N06985**. It is crucial to note the correct UNS number is **N06985**, not N06895, to avoid confusion with other alloys. --- ### **Chemical Composition** The composition is optimized for a broad spectrum of corrosion resistance, with molybdenum and copper for reducing environments and chromium for oxidizing conditions. | Element | Content (%) | | :--- | :--- | | **Nickel (Ni)** | Balance | | **Chromium (Cr)** | 21.0 - 23.5 | | **Iron (Fe)** | 18.0 - 21.0 | | **Molybdenum (Mo)** | 6.0 - 8.0 | | **Copper (Cu)** | 1.5 - 2.5 | | **Cobalt (Co)** | 5.0 max. | | **Tungsten (W)** | 1.5 max. | | **Niobium + Tantalum (Nb+Ta)** | 0.50 max. | | **Carbon (C)** | 0.015 max. | | **Manganese (Mn)** | 1.0 max. | | **Silicon (Si)** | 1.0 max. | --- ### **Physical Properties** Alloy G-3 exhibits physical properties typical of nickel-chromium-molybdenum alloys, suitable for fabricating process equipment. | Property | Value | | :--- | :--- | | **Density** | 8.31 g/cm³ (0.300 lb/in³) | | **Melting Point** | 1374 °C (2505 °F) | | **Thermal Conductivity** | 10.1 W/m·K (at 20°C) | | **Electrical Resistivity** | 1.18 μΩ·m (at 20°C) | | **Modulus of Elasticity** | 206 GPa (29.9 x 10⁶ psi) | | **Coefficient of Thermal Expansion** | 12.8 μm/m·°C (20-100°C) | | **Magnetic Response** | Essentially non-magnetic | --- ### **Mechanical Properties (Typical for Annealed Condition)** The alloy offers a good balance of strength and ductility for fabrication and service. | Property | Value (Room Temperature, Annealed) | | :--- | :--- | | **Tensile Strength** | 690 - 790 MPa (100 - 115 ksi) | | **Yield Strength (0.2% Offset)** | 310 - 380 MPa (45 - 55 ksi) | | **Elongation** | 45% - 55% | | **Hardness (Rockwell B)** | 85 - 95 HRB | --- ### **Key Characteristics & Advantages** 1. **Exceptional Versatility in Corrosive Environments:** Resists sulfuric acid, phosphoric acid, hydrochloric acid, and other strong acids, as well as acidic salt solutions. 2. **Superior Resistance to Localized Corrosion:** Offers excellent resistance to pitting and crevice corrosion, often outperforming older-generation alloys like Hastelloy G. 3. **Excellent Weldability:** Can be readily welded using common techniques (e.g., GTAW, GMAW) without significant loss of corrosion resistance in the weld area. 4. **Good Thermal Stability:** The low carbon content and balanced chemistry minimize the precipitation of carbides and intermetallic phases during exposure to high temperatures, preserving toughness and corrosion resistance. 5. **Outstanding Performance in FGD Systems:** Highly resistant to the complex, mixed acid condensates found in flue gas desulfurization (FGD) systems. --- ### **Product Applications** INCONEL Alloy G-3 is specified for critical equipment across multiple heavy industries. * **Chemical Processing:** * **Reactors, columns, and heat exchangers** for the production of acids and chemicals. * Piping systems and valves for handling aggressive media. * **Pollution Control:** * **Flue gas desulfurization (FGD) system components:** scrubbers, outlet ducts, dampers, and stack liners. * Waste incineration and acid recovery plants. * **Oil & Gas:** * Downhole and surface equipment for sour (H₂S-containing) service. * Components in acid stimulation and refining processes. * **Pharmaceutical and Agrochemical:** * Process vessels and piping requiring high purity and corrosion resistance. ### **Summary** **INCONEL Alloy G-3 (UNS N06985)** is a robust, versatile nickel-based alloy engineered to handle the broadest possible range of severe corrosive conditions. Its optimized chemistry provides a superior balance of resistance to both general and localized corrosion in oxidizing and reducing environments. Governed by standards like **ASTM B582**, and noted for its **excellent weldability and fabricability**, it is a premier material of construction for critical components in chemical processing, pollution control (FGD), and oil & gas industries, where equipment longevity and reliability are paramount for operational safety and efficiency.

Packing of Standard Packing: Typical bulk packaging includes palletized plastic 5 gallon/25 kg. pails, fiber and steel drums to 1 ton super sacks in full container (FCL) or truck load (T/L) quantities. Research and sample quantities and hygroscopic, oxidizing or other air sensitive materials may be packaged under argon or vacuum. Solutions are packaged in polypropylene, plastic or glass jars up to palletized 3306 gallon liquid totes Special package is available on request.